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ASCIICType.h
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1 /*
2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14  * its contributors may be used to endorse or promote products derived
15  * from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #ifndef WTF_ASCIICType_h
30 #define WTF_ASCIICType_h
31 
32 #include <wtf/Platform.h>
33 #include <wtf/Assertions.h>
34 
35 // The behavior of many of the functions in the <ctype.h> header is dependent
36 // on the current locale. But in the WebKit project, all uses of those functions
37 // are in code processing something that's not locale-specific. These equivalents
38 // for some of the <ctype.h> functions are named more explicitly, not dependent
39 // on the C library locale, and we should also optimize them as needed.
40 
41 // All functions return false or leave the character unchanged if passed a character
42 // that is outside the range 0-7F. So they can be used on Unicode strings or
43 // characters if the intent is to do processing only if the character is ASCII.
44 
45 namespace WTF {
46 
47  inline bool isASCIIAlpha(char c) { return (c | 0x20) >= 'a' && (c | 0x20) <= 'z'; }
48  inline bool isASCIIAlpha(unsigned short c) { return (c | 0x20) >= 'a' && (c | 0x20) <= 'z'; }
49 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
50  inline bool isASCIIAlpha(wchar_t c) { return (c | 0x20) >= 'a' && (c | 0x20) <= 'z'; }
51 #endif
52  inline bool isASCIIAlpha(int c) { return (c | 0x20) >= 'a' && (c | 0x20) <= 'z'; }
53 
54  inline bool isASCIIAlphanumeric(char c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z'); }
55  inline bool isASCIIAlphanumeric(unsigned short c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z'); }
56 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
57  inline bool isASCIIAlphanumeric(wchar_t c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z'); }
58 #endif
59  inline bool isASCIIAlphanumeric(int c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z'); }
60 
61  inline bool isASCIIDigit(char c) { return (c >= '0') & (c <= '9'); }
62  inline bool isASCIIDigit(unsigned short c) { return (c >= '0') & (c <= '9'); }
63 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
64  inline bool isASCIIDigit(wchar_t c) { return (c >= '0') & (c <= '9'); }
65 #endif
66  inline bool isASCIIDigit(int c) { return (c >= '0') & (c <= '9'); }
67 
68  inline bool isASCIIHexDigit(char c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f'); }
69  inline bool isASCIIHexDigit(unsigned short c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f'); }
70 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
71  inline bool isASCIIHexDigit(wchar_t c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f'); }
72 #endif
73  inline bool isASCIIHexDigit(int c) { return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f'); }
74 
75  inline bool isASCIILower(char c) { return c >= 'a' && c <= 'z'; }
76  inline bool isASCIILower(unsigned short c) { return c >= 'a' && c <= 'z'; }
77 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
78  inline bool isASCIILower(wchar_t c) { return c >= 'a' && c <= 'z'; }
79 #endif
80  inline bool isASCIILower(int c) { return c >= 'a' && c <= 'z'; }
81 
82  inline bool isASCIIUpper(char c) { return c >= 'A' && c <= 'Z'; }
83  inline bool isASCIIUpper(unsigned short c) { return c >= 'A' && c <= 'Z'; }
84 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
85  inline bool isASCIIUpper(wchar_t c) { return c >= 'A' && c <= 'Z'; }
86 #endif
87  inline bool isASCIIUpper(int c) { return c >= 'A' && c <= 'Z'; }
88 
89  /*
90  Statistics from a run of Apple's page load test for callers of isASCIISpace:
91 
92  character count
93  --------- -----
94  non-spaces 689383
95  20 space 294720
96  0A \n 89059
97  09 \t 28320
98  0D \r 0
99  0C \f 0
100  0B \v 0
101  */
102  inline bool isASCIISpace(char c) { return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9)); }
103  inline bool isASCIISpace(unsigned short c) { return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9)); }
104 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
105  inline bool isASCIISpace(wchar_t c) { return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9)); }
106 #endif
107  inline bool isASCIISpace(int c) { return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9)); }
108 
109  inline char toASCIILower(char c) { return c | ((c >= 'A' && c <= 'Z') << 5); }
110  inline unsigned short toASCIILower(unsigned short c) { return c | ((c >= 'A' && c <= 'Z') << 5); }
111 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
112  inline wchar_t toASCIILower(wchar_t c) { return c | ((c >= 'A' && c <= 'Z') << 5); }
113 #endif
114  inline int toASCIILower(int c) { return c | ((c >= 'A' && c <= 'Z') << 5); }
115 
116  inline char toASCIIUpper(char c) { return static_cast<char>(c & ~((c >= 'a' && c <= 'z') << 5)); }
117  inline unsigned short toASCIIUpper(unsigned short c) { return static_cast<unsigned short>(c & ~((c >= 'a' && c <= 'z') << 5)); }
118 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
119  inline wchar_t toASCIIUpper(wchar_t c) { return static_cast<wchar_t>(c & ~((c >= 'a' && c <= 'z') << 5)); }
120 #endif
121  inline int toASCIIUpper(int c) { return static_cast<int>(c & ~((c >= 'a' && c <= 'z') << 5)); }
122 
123  inline int toASCIIHexValue(char c) { ASSERT(isASCIIHexDigit(c)); return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF; }
124  inline int toASCIIHexValue(unsigned short c) { ASSERT(isASCIIHexDigit(c)); return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF; }
125 #if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
126  inline int toASCIIHexValue(wchar_t c) { ASSERT(isASCIIHexDigit(c)); return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF; }
127 #endif
128  inline int toASCIIHexValue(int c) { ASSERT(isASCIIHexDigit(c)); return c < 'A' ? c - '0' : (c - 'A' + 10) & 0xF; }
129 
130 }
131 
132 #endif
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